Re: "should use AI . ."
What I find interesting is the "social sites should police themselves" attitude. Neatly allows you to wash your hands of the issue, doesn't it ?
Nonsense. They know perfectly well that's not going to fly.
The object here is to hopefully push it until it becomes a (flawed) reality, then use the failure as an excuse to implement further censorship/blocking/report abusive material - shop in your neighbours, [facebook] friends and family (fabulous prizes to be won) 'for the public good'.